sturtevant



B. F. STURTBVANT.

Hot-Air Furnace.

No. 95,281. Patented Sept. 28 .1.869.

W {iV ZTE I MPETERS. PHOTO L THOGRAPH To an whom it may concern: v

itinitrd $111M @aiwtdtiflire.

B. F. STURTEVANT, OF JAMAICA PLAINS, MASSACHUSETTS.

Letters Patent No. 95,281, dated September 28, 1869,

HOT-AIR summon.

The Schedule referred to in these Letters Patent making part of thesame.

Be it known that I,B. F. STURTEVANT, of Jamaica Plains, in the county ofNorfolk, and State of Massa chusetts, have invented an Improvement inHeating;

.and I do hereby declare that the following, taken in connection withthe drawings, which accompany and which it was withdrawn, thus keepingup a continuous circulation of the same air, and utilizing many degreesof heat therein which would be lost if the cold outer air was taken tosupply the place of that which has lost only a portion of its heat. I

'lhis reheating and continuously circulating the same air, isparticularly applicable for drying or seasoning many kinds of material,and also for many manuiacturing operations, though it may 'be used forheating inhabited buildings and apartments where the number of occupantsis small compared to the space inhabited, so that the air will not loseana'ppreciable part of its oxygen.

This invention consists in the process of heating air, forcing the sameby power .into a confined space, and then withdrawing by power the sameair'irom said space, reheating it, and again forcing the reheated airinto the said confined. space, thus using the same air again and againby forcedcirculation, adding heat to it on its passage, which process Icarry into efieot by combining with aconfined space, such as a buildingor an apartment, and with a means for heating air, a

mechanical apparatus that will, on the application of:

power thereunto, operate to set in motion an air-current taken from thebuilding or apartment tobe heated, and pass it through the means forheating, and then when heated, send it again into the space from whichit first proceeded, so that the same air, as it falls below any desiredtemperature in the building or apartment where the heat is utilized, isreheated again and again, economizing the heat contained therein,instead of having to raise outenatmospheric air many degrees before itreaches the initiai temperature which it is desirable to have maintainedin the place to be heated.

In the drawings- Figure 1 shows, in sectional elevation, an apparatus.

suited forthe practice of my invention Figure 2 showing the saidapparatus in plan.

a represents the confined space, building, or; room to be heated. g y vThis roomis connected by suitable pipes with an air-heater, and with amechanical means for creating,

by application of force, a continuous circulating current of air throughsaid pipes and heater.

The means shown in the drawings for creating the air current is a rotaryblower, b, which connects with the room a -by a pipe, 0, through whichair is forced '"from the blower into the room, and by a pipe d,

through which air is taken from the room, and by passing through aheater, e, and the-blower, is-again forced into the room, carrying withit an increment of heat. 1

The heater shown is designed to make use of exhaust steam to heat theair as it passes from the room through the blower back to the roomagain, said heater being made as a casing or drum, in the heads of whichtubes are fixed, so thatthe steam passing in at the entrance f, and outat the egress passage g, shall pass around .the tubes, and heat the airmoving through them in its circulation from the roomba'ck to it again. v

The pipes entering and leading from the room may belocated as found bestadapted to keep up uniformity of temperature therein, the pipe takingair out of the room being placed where the lowest temperature in theroom is found, and partial partitions maybe placed in the room tomake,'if desired, a tortuous passage for theair in proceeding in theroom from its inlet to its outlet. 7

In some cases, as in dry houses and workshops, the air-heating andcurrent-creating apparatus may preferably belocated directly in thespace in which air is to be heated and circulated, as thereby theexpense of conveying-pipes is avoided. v g

I. claim the process of utilizing heat by a forced and repeatedcircuitof the heated-air of an apartmen through a heater, substantiallyas described.

' '13. F. STURTEVANT;

Witnesses:

J. B. GnosBY, FRANCIS GOULD.

